refactor: update content structure and layout templates

- Updated author format in content files
- Added section field to content files
- Simplified categories format
- Removed no-category.html layout
- Updated list.html and single.html layouts
- Updated index.html layout
- Updated generate-content.js script
- Do not index content with git

content/bittorrent/2017-01-5-sites-torrents/index.md

@@ -6,9 +6,10 @@ slug: "5-sites-torrents"
 wordpress_id: 106
 excerpt: "Voici un top des sites pour le téléchargement Torrent. Après mon TOP 5 des VPN à utiliser et…\n"
 featured_image: ""
-author: {"id":1,"name":"Kevin"}
-categories: [{"id":199,"name":"Bittorrent","slug":"bittorrent"}]
+author: "Kevin"
+categories: ["Bittorrent"]
 tags: []
+section: "bittorrent"
 ---
 
 </p>